<template>
  <el-dialog
    width="500px"
    title="员工导入"
    :visible="showExcelDialog"
    @close="$emit('update:showExcelDialog', false)"
  >
    <el-row type="flex" justify="center">
      <div class="upload-excel">
        <!-- change事件会在文件选中后触发 => change有可能不触发 => 文件选择框的值没有清空 -->
        <input
          ref="excel-upload-input"
          class="excel-upload-input"
          type="file"
          accept=".xlsx, .xls"
          @change="handleChange"
        >
        <div class="drop">
          <i class="el-icon-upload" />
          <el-button type="text" @click="download">下载导入模板</el-button>

          <span>将文件拖到此处或
            <el-button type="text" @click="upload">点击上传</el-button>

          </span>

        </div>

      </div>

    </el-row>

    <el-row type="flex" justify="end">
      <!-- update:props属性名，值 直接修改 .sync修饰符的属性值 -->
      <el-button size="mini" type="primary" @click="$emit('update:showExcelDialog', false)">取消</el-button>

    </el-row>

  </el-dialog>

</template>

<script>
import { getExportTemplate, uploadExcel } from '@/api/employee'
import FileSaver from 'file-saver'
export default {
  props: {
    showExcelDialog: {
      type: Boolean,
      default: false
    }
  },
  methods: {
    async download() {
      // 1. 调用接口 获取文件模板  二进制流
      const res = await getExportTemplate()
      // 2. 保存文件
      FileSaver.saveAs(res, '员工导入模板.xlsx')
    },
    upload() {
      // 选中刚刚的那个模板文件(前提你填了至少一行数据)  调用后端接口即可
      this.$refs['excel-upload-input'].click() // 模拟触发input的点击事件 => 隔山打牛
    },
    async handleChange(e) {
      console.log('change触发了')
      const files = e.target.files
      if (files.length > 0) {
        const temp = new FormData()
        temp.append('file', files[0])
        await uploadExcel(temp)
        // 提示
        this.$message.success('上传成功')
        // 通知父组件关闭弹窗
        this.$emit('update:showExcelDialog', false)
        // 通知父组件刷新数据(请求获取数据)
        this.$emit('refresh')
        // 清空文件框的值 , 不然不可以二次上传
        this.$refs['excel-upload-input'].value = ''
      }
    }
  }
}
</script>

<style scoped lang="scss">
    .upload-excel {
      display: flex;
      justify-content: center;
      margin: 20px;
      width: 360px;
      height: 180px;
      align-items: center;
      color: #697086;
      .excel-upload-input {
        display: none;
        z-index: -9999;
      }
      .btn-upload,
      .drop {
        border: 1px dashed #dcdfe6;
        width: 100%;
        height: 100%;
        text-align: center;
        line-height: 160px;
        border-radius: 8px;
        display: flex;
        flex-direction: column;
        justify-content: center;
      }
      .drop {
        line-height: 40px;
        color: #bbb;
        i {
          font-size: 60px;
          display: block;
          color: #c0c4cc;
        }
      }
    }
</style>
